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Published byReyna Grim Modified about 1 year ago

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Digital to Analog Converter By Rushabh Mehta Manthan Sheth

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12 Progress Current to Voltage converter V out

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1. I-V conversion Using a current mirror and load as ground connected PMOS. Possibly the best way to get linear I-V conversion. We evaluated the use of NMOS/PMOS in diode configuration in all possible ways (Doesn’t work) – Always, non-linearity comes when transistor goes from cut-off to saturation. – So, we need to give a constant fixed biasing.

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Simulation Result When all 12 bits are ON => Output voltage = 0.75V When all 12 bits are OFF => Output voltage= 2.5V Total Swing = 2.5V to 0.75V

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Binary weighted section design Need unit current sources. From our calculation, we need a maximum total current of 3.84uA from binary weighted 4 LSB bits => unit current source = 256nA.

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Binary weighted section design 4 bit LSB binary encoder

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Binary encoder simulation result Matches perfectly with what was desired. Swing = 2.5V- 0.75V = 1.75V Voltage change when all 4 bits ON = Output voltage = 2.5V – 6.835mV = V

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Thermometer encoder design Dummy section 4 Bits 2 Bits LSB MSB Y3 Y2 Y1 Y0 A1A0Y0Y1Y2Y Y0 = VDD Y1= A1+A0 Y2= A1 Y3= A1.A0

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Thermometer encoder design A0A1 Y1 Y2 Y3

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Thermometer encoder simulation result A1 A0 Y1 Y2 Y3

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Next Designing unit current sources for the thermometer coded section. Level inverter and shifter after I-V conversion. Designing delay block at the input of binary encoder.

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